package usb;

public class Computer {
    public void powerOn(){
        System.out.println("打开笔记本电脑");
    }
    public void poweroff(){
        System.out.println("关闭笔记本电脑");
    }
    public void useDevice(USB usb){
        usb.closeDevice();
        if (usb instanceof Mouse){
            Mouse mouse=(Mouse) usb;
            mouse.click();

        }else if (usb instanceof keyBoard){
            keyBoard keyBoard=(usb.keyBoard) usb;
            keyBoard.input();
        }
        usb.closeDevice();
    }
}
